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Restatement of Consolidated Financial Statements - Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Revenue            
Revenue $ 84,859 $ 61,717 $ 155,241 $ 127,494    
Gross profit 67,981 45,569 121,011 95,461    
Operating expenses            
Sales, general and administrative 22,184 21,721 45,746 45,027    
Total operating expenses 53,882 56,657 110,395 116,011    
Operating income (loss) 14,099 (11,088) 10,616 (20,550)    
Interest income and other income (expense), net   4,688   11,131    
Interest and other income (expense), net (302) 2,108 65 5,996    
Income (loss) before income taxes   (8,980)   (14,554)    
Provision for income taxes 2,631 160 2,128 1,125    
Net income (loss) 11,166 $ (9,140) 8,553 $ (15,679)    
Net income (loss) per share:            
Basic (in dollars per share)   $ (0.08)   $ (0.14)    
Diluted (in dollars per share)   $ (0.08)   $ (0.14)    
As originally reported            
Revenue            
Revenue   $ 59,930   $ 123,919    
Gross profit   43,782   91,886    
Operating expenses            
Sales, general and administrative   21,310   44,205    
Total operating expenses   56,246   115,189    
Operating income (loss)   (12,464)   (23,303)    
Interest income and other income (expense), net   4,597   10,971    
Interest and other income (expense), net   2,017   5,836    
Income (loss) before income taxes   (10,447)   (17,467)    
Provision for income taxes   334   1,297    
Net income (loss)   $ (10,781)   $ (18,764)    
Net income (loss) per share:            
Basic (in dollars per share)   $ (0.09)   $ (0.17)    
Diluted (in dollars per share)   $ (0.09)   $ (0.17)    
Adjustments            
Revenue            
Revenue   $ 1,787   $ 3,575    
Gross profit   1,787   3,575    
Operating expenses            
Sales, general and administrative   411   822    
Total operating expenses   411   822    
Operating income (loss)   1,376   2,753    
Interest income and other income (expense), net   91   160    
Interest and other income (expense), net   91   160    
Income (loss) before income taxes   1,467   2,913    
Provision for income taxes   (174)   (172)    
Net income (loss)   $ 1,641   $ 3,085    
Net income (loss) per share:            
Basic (in dollars per share)   $ 0.01   $ 0.03    
Diluted (in dollars per share)   $ 0.01   $ 0.03    
Royalties            
Revenue            
Revenue $ 41,910 $ 18,744 $ 70,769 $ 40,226    
Royalties | As originally reported            
Revenue            
Revenue   16,957   36,651    
Royalties | Adjustments            
Revenue            
Revenue   $ 1,787   $ 3,575 $ 3,600 $ 3,600